You can use the 2019 election ONLY if the earned income in 2019 is greater than 2021, If your income in 2021 is greater, you can not use this election. It was designed for the people who were used to get the EITC before the virus and were affected by the pandemic in 2020 and 2021. Again, if you made more in 2021 than in 2019, it means you gained during the pandemic, so not election is allowed in that case. Thank you.